<!DOCTYPE html>
<html lang="en">
<head>
    <meta charset="UTF-8">
    <meta name="viewport" content="width=device-width, initial-scale=1.0">
    <title>Document</title>
</head>
<body>
    <style>
        * {
            margin: 0;
            padding: 0;
        }
        .container {
            width: 300px;
            height: 400px;
            background: #ccc;
            position: relative;
        }
        .good {
            position: absolute;
            bottom: 10px;
            left: 50%;
            cursor: pointer;
            width: 60px;
            height: 60px;
            background: url('./good.png') no-repeat center center;
        }
        .animate1 {
            animation: moveStart 4s linear 1 forwards;
        }
        /* .animate2 {
            animation: big .5s linear 1 forwards;
        } */
        @keyframes big {
            0% {
                transform: scale(.3);
            }
            100% {
                transform: scale(1);
            }
        }
        @keyframes moveStart {
            0% {
                transform: scale(.3);
                margin-bottom: 0;
            }
            25% {
                margin-left:-8px;
            }
            50% {
                margin-left:8px
            }
            75% {
                opacity: 1;
                margin-left:-15px
            }
            100% {
                margin-bottom: 400px;
                transform: scale(1);
                opacity: 0;
                margin-left:15px;
            }
        }
    </style>
    <div class="container">
        <div class="good animate1 animate2"></div>
    </div>
</body>
</html>